Just because an item enters into public record as evidence in court does not mean it has no copyright.
A personal calendar, with comments and thoughts and expressions, is going to be automatically covered by copyright.
If this pillow isn’t licensed through Brett Kavanaugh or his legal representative, then he could come after the creator and get a cut. Either way you’ll end up paying Kavanaugh for this shit.
DISCLAIMER: IANAL, but I am willing to play one for comedic purposes.